Attch A_ENCL 1_LOMR 15-09-1082P.pdf

Federal Emergency Management AgeWlo Washington, D.C. 20472

June 1, 2015 ZCl5 JU~' -8 Pti 4; 03

CERTIFIED MAIL

RETURN RECEIPT REQUESTED

The Honorable Steve Sisolak Chairman, Clark County Board of Commissioners 500 South Grand Central Parkway Las Vegas, NV 89106

Dear Mr. Sisolak:

IN REPLY REFER TO:

Case No.:

Follows Conditional Case No.:

Community Name:

Community No.:

Effective Date of This Revision:

15-09-1082P

12-09-3149R Clark County, NV 320003

October 14, 2015

The Flood Insurance Study Report and Flood Insurance Rate Map for your community have been revised by this Letter of Map Revision (LOMR). Please use the enclosed annotated map panel(s) revised by this LOMR for floodplain management purposes and for all flood insurance policies and renewals issued in your community.

Additional documents are enclosed which provide information regarding this LOMR. Please see the List of Enclosures below to determine which documents are included. Other attachments specific to this request may be included as referenced in the Determination Document. If you have any questions regarding floodplain management regulations for your community or the National Flood Insurance Program (NFIP) in general, please contact the Consultation Coordination Officer for your community. If you have any technical questions regarding this LOMR, please contact the Director, Mitigation Division of the Department of Homeland Security's Federal Emergency Management Agency (FEMA) in Oakland, California, at (510) 627-7175, or the FEMA Map Information eXchange toll free at 1-877-336-2627 (1-877-FEMA MAP). Additional information about the NFIP is available on our website at http://www.fema.gov/business/nfip.

Luis Rodriguez, P.E., Chief Engineering Management Branch Federal Insurance and Mitigation Administration

List of Enclosures:

Letter of Map Revision Determination Document Annotated Flood Insurance Rate Map Annotated Flood Insurance Study Report cc: Mr. Joe Damiani Clark County Flood Control District

Ms. Mona W. Stammetti Principal Civil Engineer Clark County Public Works Department

Mr. Ryan R. Belsick, P .E.

Vice President G.C. Wallace, Inc.

Ms. Rachel R. Dennis, P .E.

Project Manager G.C. Wallace, Inc.

1 of 8 Enclosure 1

Enclosure 1:

LOMR 15-09-1082P, Oct. 14, 2015

Case No.: Page 1 of 4 Effective Date: October 14, 2015Issue Date: June 1, 2015 LOMR-APP

Follows Conditional Case No.: 12-09-3149R

15-09-1082P

Washington, D.C. 20472

Federal Emergency Management Agency

LETTER OF MAP REVISION

DETERMINATION DOCUMENT

COMMUNITY AND REVISION INFORMATION PROJECT DESCRIPTION

COMMUNITY

APPROXIMATE LATITUDE & LONGITUDE: 36.110, -115.150

SOURCE: USGS QUADRANGLE DATUM: NAD 83

Clark County Nevada

(Unincorporated Areas)

COMMUNITY NO.: 320003

BASIS OF REQUEST

IDENTIFIER

CHANNELIZATION

FLOODWALL

STORM DRAIN

FLOODWAY

HYDRAULIC ANALYSIS

LEVEE CERTIFICATION

UPDATED TOPOGRAPHIC DATA

Tropicana Wash Levee At Swenson Street

ANNOTATED MAPPING ENCLOSURES ANNOTATED STUDY ENCLOSURES

DATE: November 16, 2011 NO.: 32003C2557F TYPE: FIRM* DATE OF EFFECTIVE FLOOD INSURANCE STUDY: November 16, 2011

PROFILE(S): 91P

FLOODWAY DATA TABLE: TABLE 5

Enclosures reflect changes to flooding sources affected by this revision.

* FIRM - Flood Insurance Rate Map; ** FBFM - Flood Boundary and Floodway Map; *** FHBM - Flood Hazard Boundary Map

FLOODING SOURCE(S) & REVISED REACH(ES)

Tropicana Wash - Central Branch - from approximately 270 feet downstream of Flamingo Road to approximately 1,210 feet upstream of Swenson Street

SUMMARY OF REVISIONS

Revised Flooding Effective Flooding Flooding Source Increases Decreases

Tropicana Wash - Central Branch Zone AE Zone AE NONE YES

BFEs* BFEs YES YES

Floodway Floodway NONE YES

* BFEs - Base Flood Elevations

DETERMINATION

This document provides the determination from the Department of Homeland Security's Federal Emergency Management Agency (FEMA) regarding a request for a Letter of Map Revision (LOMR) for the area described above. Using the information submitted, we have determined that a revision to the flood hazards depicted in the Flood Insurance Study (FIS) report and/or National Flood Insurance Program (NFIP) map is warranted. This document revises the effective NFIP map, as indicated in the attached documentation. Please use the enclosed annotated map panels revised by this LOMR for floodplain management purposes and for all flood insurance policies and renewals in your community.

This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document, please contact the FEMA Map Information eXchange toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 847 South Pickett Street, Alexandria, VA 22304-4605. Additional Information about the NFIP is available on our website at http://www.fema.gov/nfip.

15-09-1082P 102-I-A-C

Luis Rodriguez, P.E., Chief Engineering Management Branch Federal Insurance and Mitigation Administration

2 of 8 Enclosure 1

Case No.: Page 2 of 4 Effective Date: Issue Date: LOMR-APP15-09-1082P

Issue Date: June 1, 2015 Effective Date: October 14, 2015

Federal Emergency Management Agency

LETTER OF MAP REVISION

DETERMINATION DOCUMENT (CONTINUED)

COMMUNITY INFORMATION

APPLICABLE NFIP REGULATIONS/COMMUNITY OBLIGATION

We have made this determination pursuant to Section 206 of the Flood Disaster Protection Act of 1973 (P.L. 93-234) and in accordance with the National Flood Insurance Act of 1968, as amended (Title XIII of the Housing and Urban Development Act of 1968, P.L. 90-448), 42 U.S.C. 4001-4128, and 44 CFR Part 65. Pursuant to Section 1361 of the National Flood Insurance Act of 1968, as amended, communities participating in the NFIP are required to adopt and enforce floodplain management regulations that meet or exceed NFIP criteria. These criteria, including adoption of the FIS report and FIRM, and the modifications made by this LOMR, are the minimum requirements for continued NFIP participation and do not supersede more stringent State/Commonwealth or local requirements to which the regulations apply.

We provide the floodway designation to your community as a tool to regulate floodplain development. Therefore, the floodway revision we have described in this letter, while acceptable to us, must also be acceptable to your community and adopted by appropriate community action, as specified in Paragraph 60.3(d) of the NFIP regulations.

NFIP regulations Subparagraph 60.3(b)(7) requires communities to ensure that the flood-carrying capacity within the altered or relocated portion of any watercourse is maintained. This provision is incorporated into your community’s existing floodplain management ordinances; therefore, responsibility for maintenance of the altered or relocated watercourse, including any related appurtenances such as bridges, culverts, and other drainage structures, rests with your community. We may request that your community submit a description and schedule of maintenance activities necessary to ensure this requirement.

COMMUNITY REMINDERS

We based this determination on the 1-percent-annual-chance flood discharges computed in the FIS for your community without considering subsequent changes in watershed characteristics that could increase flood discharges. Future development of projects upstream could cause increased flood discharges, which could cause increased flood hazards. A comprehensive restudy of your community’s flood hazards would consider the cumulative effects of development on flood discharges subsequent to the publication of the FIS report for your community and could, therefore, establish greater flood hazards in this area.

Your community must regulate all proposed floodplain development and ensure that permits required by Federal and/or State/Commonwealth law have been obtained. State/Commonwealth or community officials, based on knowledge of local conditions and in the interest of safety, may set higher standards for construction or may limit development in floodplain areas. If your State/Commonwealth or community has adopted more restrictive or comprehensive floodplain management criteria, those criteria take precedence over the minimum NFIP requirements.

We will not print and distribute this LOMR to primary users, such as local insurance agents or mortgage lenders; instead, the community will serve as a repository for the new data. We encourage you to disseminate the information in this LOMR by preparing a news release for publication in your community's newspaper that describes the revision and explains how your community will provide the data and help interpret the NFIP maps. In that way, interested persons, such as property owners, insurance agents, and mortgage lenders, can benefit from the information.

This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document, please contact the FEMA Map Information eXchange toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 847 South Pickett Street, Alexandria, VA 22304-4605. Additional Information about the NFIP is available on our website at http://www.fema.gov/nfip.

15-09-1082P 102-I-A-C

Luis Rodriguez, P.E., Chief Engineering Management Branch

3 of 8 Enclosure 1

Case No.: Page 3 of 4 Effective Date: Issue Date: LOMR-APP15-09-1082P

Issue Date: June 1, 2015 Effective Date: October 14, 2015

Federal Emergency Management Agency

LETTER OF MAP REVISION

DETERMINATION DOCUMENT (CONTINUED)

We have designated a Consultation Coordination Officer (CCO) to assist your community. The CCO will be the primary liaison between your community and FEMA. For information regarding your CCO, please contact:

Mr. Jeffrey D. Lusk Director, Mitigation Division

Federal Emergency Management Agency, Region IX 1111 Broadway, Suite 1200 Oakland, CA 94607-4052

(510) 627-7175

STATUS OF THE COMMUNITY NFIP MAPS

We will not physically revise and republish the FIRM and FIS report for your community to reflect the modifications made by this LOMR at this time. When changes to the previously cited FIRM panel(s) and FIS report warrant physical revision and republication in the future, we will incorporate the modifications made by this LOMR at that time.

This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document, please contact the FEMA Map Information eXchange toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 847 South Pickett Street, Alexandria, VA 22304-4605. Additional Information about the NFIP is available on our website at http://www.fema.gov/nfip.

15-09-1082P 102-I-A-C

Luis Rodriguez, P.E., Chief Engineering Management Branch

4 of 8 Enclosure 1

Case No.: Page 4 of 4 Effective Date: Issue Date: LOMR-APP15-09-1082P

Effective Date: October 14, 2015Issue Date: June 1, 2015

Federal Emergency Management Agency

LETTER OF MAP REVISION

DETERMINATION DOCUMENT (CONTINUED)

PUBLIC NOTIFICATION OF REVISION

A notice of changes will be published in the Federal Register. This information also will be published in your local newspaper on or about the dates listed below and through FEMA’s Flood Hazard Mapping website at https://www.floodmaps.fema.gov/fhm/Scripts/bfe_main.asp.

LOCAL NEWSPAPER Name: Las Vegas Review-Journal Dates: June 9, 2015 and June 16, 2015

Within 90 days of the second publication in the local newspaper, a citizen may request that we reconsider this determination. Any request for reconsideration must be based on scientific or technical data. Therefore, this letter will be effective only after the 90-day appeal period has elapsed and we have resolved any appeals that we receive during this appeal period. Until this LOMR is effective, the revised flood hazard determination information presented in this LOMR may be changed.

This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have any questions about this document, please contact the FEMA Map Information eXchange toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 847 South Pickett Street, Alexandria, VA 22304-4605. Additional Information about the NFIP is available on our website at http://www.fema.gov/nfip.

15-09-1082P 102-I-A-C

Luis Rodriguez, P.E., Chief Engineering Management Branch

5 of 8 Enclosure 1

WITHOUT

FLOODWAY

WITH

FLOODWAY

REVISED DATA

0.992 110 586 5.7 2,062.8 2,062.8 2,062.8 0.0

1.036 98 584 6.8 2,063.0 2,063.0 2,063.0 0.0

1.073 92 396 8.4 2,063.2 2,063.2 2,063.2 0.0

1.080 54 166 20.0 2,063.4 2,063.4 2,063.4 0.0

1.095 67 283 11.8 2,065.9 2,065.9 2,065.9 0.0

2.566 110 920 1.7 2,157.0 2,157.0 2,157.0 0.0

2.649 44 419 5.2 2,157.3 2,157.3 2,157.4 0.1

2.722 100 150 6.9 2,159.2 2,159.2 2,159.2 0.0

2.845 45 114 9.1 2170.8 2170.8 2170.8 0.0

2.877 33 132 9.7 2172.9 2172.9 2172.9 0.0

3.158 23 99 8.1 2,191.5 2,191.5 2,191.5 0.0

3.217 48 141 5.7 2,200.7 2,200.7 2,201.5 0.8

3.361 10 92 12.0 2,208.0 2,208.0 2,208.7 0.7

1 Miles above confluence with Flamingo Wash 2 Floodway not computed REVISED DATA 3 Cross sections removed

T A

B L

E

FEDERAL EMERGENCY MANAGEMENT AGENCY

CLARK COUNTY, NV

AND INCORPORATED AREAS

FLOODWAY DATA

TROPICANA WASH-CENTRAL BRANCH

Y

Z-AE2

AF

AG

AH

AI

AJ

AK-AL2

AM

AN

AO

FLOODING SOURCE FLOODWAY

BASE FLOOD

WATER SURFACE ELEVATION

Tropicana Wash- Central Branch

A-B2

CROSS SECTION DISTANCE1

WIDTH

(FEET)

SECTION

AREA

(SQUARE

FEET)

MEAN

VELOCITY

(FEET PER

SECOND)

F-K3

REGULATORY INCREASEFEET (NAVD)

X

C-E2

L-T2

U V

W

October 14, 2015

REVISED TO

REFLECT LOMR

EFFECTIVE:

6 of 8 Enclosure 1

Oc to be r 1

4, RE

VI

SE

D

TO

RE

FL

EC

T

LO

MR

EF

FE

CT

IV

E:

7 of 8 Enclosure 1

REVISED

AREA

CLARK COUNTY

Unincorporated Areas

320003

LEVEE

CLARK COUNTY

Unincorporated Areas

320003

LIMIT OF

STUDY

Flamingo Wash

1-PERCENT

ANNUAL CHANCE

FLOOD DISCHARGE

CONTAINED IN

STORM DRAIN

Flamingo Wash

Tropicana Wash Central Branch

ZONE AE

2018.1

Dri Bridge

1-PERCENT

ANNUAL CHANCE

FLOOD DISCHARGE

CONTAINED IN

STORM DRAIN

2038.2

2035.8

S W

E N

S O

N S

T R

E E

T

1-PERCENT

ANNUAL

CHANCE FLOOD

DISCHARGE

CONTAINED

IN CHANNEL

2019.4

1-PERCENT

ANNUAL

CHANCE FLOOD

DISCHARGE

CONTAINED

IN CHANNEL

2033.5

ZONE AE

2019.4

NOTE: MAP AREA

SHOWN ON THIS PANEL

IS LOCATED WITHIN

TOWNSHIP 21 SOUTH,

RANGE 61 EAST.

1-PERCENT

ANNUAL CHANCE

FLOOD DISCHARGE

CONTAINED IN

CHANNEL

SWENSON STREET

2038.0

2035.0

2034.7 2033.5

2037.0 2036.0

1-PERCENT

ANNUAL CHANCE

FLOOD DISCHARGE

CONTAINED IN

STORM DRAIN

1-PERCENT ANNUAL

CHANCE FLOOD

DISCHARGE CONTAINED

IN STRUCTURE,D,E

,C

E FLAMINGO ROAD

E HARMON AVENUE

S M

A R

Y L

A N

D P

A R

K W

A Y

P A

R A

D

IS

E R

O A

D

COTTAGE GROVE AVENUE

V

IS

B Y

L A

N E

P A

L O

S V

E R

D E

S S

T R

E E

T

T O

R S

B Y

P L

A C

E

ALBERT AVENUE

V O

X N

A S

T R

E E

T

G Y

M D

R

IV

E

C O

T T A

G E

C

IR

C L

E

C H

A T

H A

M C

IR

C

L E

E HARMON AVENUE

THIS AREA IS SHOWN AS BEING PROTECTED

FROM THE 1-PERCENT ANNUAL CHANCE OR

GREATER FLOOD HAZARD BY A FLOOD WALL SYSTEM.

OVERTOPPING OR FAILURE OF ANY FLOOD WALL

SYSTEM IS POSSIBLE. FOR ADDITIONAL INFORMATION SEE

'THE ACCREDITED LEVEE NOTE" IN THE NOTE TO USERS.

ACCREDITED LEVEE NOTES TO USERS: If an accredited levee note appears on this panel check with your local community to obtain more information, such as the estimated of level of protection provided (which may exceed the 1-percent-annual-chance level) and Emergency Action Plan, on the levee system(s) shown as providing protection. To mitigate flood risk in residual areas, property owners and residents are encouraged to consider flood insurance and floodproofing or other protective measures. For more information on flood insurance, interested parties should visit the FEMA Website at http://www.fema.gov /business/nfip/index.shtm

ZONE A

ZONE A

1-PERCENT ANNUAL CHANCE

FLOOD DISCHARGE CONTAINED

IN CHANNELMCKELLAR CIRCLE

SPECIAL FLOOD

HAZARD AREAS

OTHER AREAS OF

FLOOD HAZARD

Without Base Flood Elevation (BFE)

With BFE or Depth

Regulatory Floodway

Zone A,V, A99

Zone AE, AO, AH, VE, AR

0.2% Annual Chance Flood Hazard, Areas of 1% annual chance flood with average depth less than one foot or with drainage areas of less than one square mile

Future Conditions 1% Annual Chance Flood Hazard

Area with Reduced Flood Risk due to Levee See Notes.

Zone X

Zone X

Zone X

SCALE

NATIONAL FLOOD INSURANCE PROGRAM

FLOOD INSURANCE RATE MAP

CLARK COUNTY, NEVADA

AND INCORPORATED AREAS

PANEL 2557 OF 4090

Panel Contains:

COMMUNITY NUMBER PANEL SUFFIX

MAP NUMBER

EFFECTIVE DATE

November 16, 2011

32003C2557F

VERSION NUMBER

1.0.0.0

CLARK COUNTY 320003 2557 F

1:6,000

0 530 1,060265 Feet

1 inch = 500 feet

Map Projection:

NAD 1983 UTM Zone 11N;

Western Hemisphere; Vertical Datum: NAVD 88

0 140 28070 Meters

October 14, 2015

REVISED TO

REFLECT LOMR

EFFECTIVE:

8 of 8 Enclosure 1

October 14, 2015